Agricultural funicular traction system with electric propulsion

ABSTRACT

The invention concerns an agricultural funicular traction system with electric propulsion, said system comprising two agricultural machineries, respectively one left-handed machinery ( 1 ) and one right-handed machinery ( 1 ), working as a couple, said machineries ( 1 ) left-handed and right-handed being technically identical, each machinery ( 1 ) providing a frame ( 2 ), with four wheels ( 3 ), a driving and reversible control unit ( 4 ), a hoist ( 5 ), provided with safety clutch ( 16 ), round which a cable ( 13 ) winds, jacks ( 9 ) for steadiness, on the working side of the machinery ( 1 ), towards the field to till, and weights ( 10 ) for steadiness (counterweights), means for independent and remote automatic driving, the work as a couple of said machineries ( 1 ) left-handed and right-handed being realized by means of said cable ( 13 ) having appropriate elasticity and tensile strength features, that extends, winding and unwinding during the work, between the respective hoists ( 5 ) of the two machineries ( 1 ), on said cable ( 13 ) being provided an agricultural tool ( 100 ) that moves, at the same time as said cable ( 13 ) winds around said hoists ( 5 ), between said left-handed and right-handed machineries ( 1 ), said system being characterised in that it is provided, in correspondence of the coupling of the agricultural tool ( 100 ) with said cable ( 13 ), with a telescopic arm able to lift the cable ( 13 ) during the advancement of the machineries ( 1 ) for the positioning in the next work position.

The present invention relates to an agricultural funicular traction system with electric propulsion.

More specifically, the invention concerns a system of the above kind comprising two machineries; each one specifically studied and realised so as to permit exploiting at best peculiarities of the technology employing agricultural funicular traction machines.

Funicular traction plowing is known at least since the end of XIX century.

Observing collateral phenomenons connected with modern agricultural techniques, always more jeopardizing ecosystem of agricultural ground, applicants have understood that application of funicular traction plowing could solve many of the problems connected with the modern agriculture.

Particularly, it has been observed that elements more contributing decaying of ground soil structure are repeated passage on ground with heavy machines, causing compaction of underlying ground structure, destroying bacterial micro fauna, essential to the ground life, modifying its hydrologic features.

As already mentioned, it is known that agricultural tools (such as plows, harrows, seeders, manures, sprayers, ecc.) employed for working ground have been, during a set historical period (from about 1850 to about 1940) operated by funicular traction systems.

The above technology started developing when vapour power has been developed, up to when combustion traction machineries have was available having a sufficient power to move them, also taking into consideration its weight necessary to ensure sufficient adhesion on ground, and at the same time towing the above agricultural tools.

Abandonment of the above technology coincides with growing of wheel power available on modern traction machineries, and with new tyres, by which the latter have been successfully employed, abandoning funicular traction systems.

As to the funicular traction, its main applications have been developed employing vapour propulsion funicular traction machines (also known as “fables”).

Some indications are still available of their use in funicular traction systems in Italy since 1890 (Conte Eng. De Asada at Fraforeano, Barone Traves di Boinfigli, Verona, Doct. Cattadori, Piacenza). In this case, they were spiral systems, i.e. systems with a rope surrounding the field. In other words, old Howard apparatuses have been used, with drum hoist, e.g. manufactured by Violati Tescari at Ariano Polesine that, with a prototype realised during 1913, was present at the Monocoltura contest at Parma.

Next generation employed Fowler technology, based on providing two opposite hoists on headland of ground to be cultivated.

As of 1914, attention of manufacturers was always more based on the latter systems, since they improved mechanical efficiency with respect to the previous generations. An example of said technology is the machine manufactured by Brioschi company on behalf of Imprese Elettriche, Milan, Italy.

Main problem of the above technology is that connected with the type of propulsion, and particularly heavy weight with respect to power available and outer difficulties during displacements.

On the basis of the above, Applicants have realised technical solutions permitting a positive and innovative application of funicular traction plowing technology, exploiting its positive peculiarities.

Main object of the present invention is that of providing a technical solution by introducing electric propulsion in funicular traction plowing, in order to avoid all the above mentioned technical problems.

Other object of the present invention is that of providing a solution permitting satisfying CHG emission required provided by Kyoto 2 protocol, as well as almost total reduction of noise, causing alteration of natural environment equilibrium.

Further object of the present invention is that of providing a solution that can drastically modify traditional earth-man anthropologic relationships, usually based on physical fatigue.

A further object of the present invention is that of providing a solution maintaining the feature of not degrading physical structure of ground during its working by repeated passages over the field of traditional agricultural machineries (that are always more powerful, heavy and polluting).

These and other results are obtained according to the present invention suggesting a system employing two machineries that can operate as self-moving funicular traction plowing machine, with automatic driving and electric propulsion, that can be quite easily realised and practically realised, that can be safely and efficiently operated, as well not expensive.

It is therefore specific object of the present invention an agricultural funicular traction system with electric propulsion, said system comprising two agricultural machineries, respectively one left-handed and one machinery right-handed machinery, working as a couple, said machineries left-handed and right-handed being technically identical, each machinery providing a frame, with four wheels, a driving and reversible control unit, a hoist, provided with safety clutch, round which a cable winds, jacks for steadiness, on the working side of the machinery, towards the field to till, and weights for steadiness (counterweights), means for independent and remote automatic driving, the work as a couple of said machineries left-handed and right-handed being realized by means of said cable having appropriate elasticity and tensile strength features, that extends, winding and unwinding during the work, between the respective hoists of the two machineries, on said cable being provided an agricultural tool that moves, at the same time as said cable winds around said hoists, between said left-handed and right-handed machineries, said system being characterised in that it is provided, in correspondence of the coupling of the agricultural tool with said cable, with a telescopic arm able to lift the cable during the advancement of the machineries for the positioning in the next work position.

Always according to the invention four driving and steering wheels are provided.

Particularly, said hoist is provided of an engine and batteries, preferably batteries supplied with power provided by a power line connected to an electric cable and/or solar array set on each machinery, and said jacks for steadiness are electric jacks.

Furthermore, according to the invention, on each machinery a tool carrier and reclining work surface, as well as a turret for positioning equipments for the independent and remote automatic driving and/or communication equipments are provided.

Still according to the invention, the system comprises a quick hook and release system for said working tools.

Particularly, said system can comprise at least one of the following tools:

-   -   single or multi furrow reversible plough,     -   reversible harrow with springs, spikes or discs,     -   reversible mower,     -   two-faced sowing machine with automatic loading,     -   two-faced manure machine with automatic loading,     -   two-faced spraying bar,     -   subsoiler or ripper,     -   bidirectional roller, Cambridge type or smooth type,     -   harvesting head.

Preferably, said means for independent and remote automatic driving allow implementing an automatic driving system that permits the user to:

-   -   set in a safety mode (with stop) in case of breakdowns or         anomalies;     -   define the working perimeter and the field tilling modes;     -   follow the established way with the two machineries;     -   keep the same distance between the two machineries;     -   slow down or accelerate the work according to the inputs got         from optional WSN sensors set on the working tools;     -   to make an emergency stop in case of obstacles laying in the         way.

Particularly, perimeter of the field to till is materialized in a boundary that can be revealed by a laser scanner (wire netting, fence, boundary wall, hedge, or posts spaced at the same distance apart, too), so that, by a GIS (Geographical Information System) graphic application on a console, the user locates the field perimeter physically materialized, said means for independent and remote automatic driving verifies the material boundary position, revealed by laser scanner and geo-referenced by GPS, agree to inputs (and maps), in case of anomalies (physic boundary is absent or does not agree with maps), the system getting into safe mode, stopping the work and sending an alarm to the console.

According to the invention, said means for independent and remote automatic driving on each machinery comprises:

-   -   systems on the two machineries, comprising a processing unit; a         communication unit; a GPS receiver; a laser scanner; a camera         (optional); and     -   a remote control console comprising a control computer, a         graphical user interface and a communication unit.

The present invention will be now described, for illustrative, but not limitative purposes, according to its preferred embodiments, with particular reference to the figures of the enclosed drawings, wherein:

FIG. 1 is a rear perspective view of an embodiment of a (left-handed) machinery of the system according to the invention;

FIG. 2 is an exploded view of a machinery (right-handed) of the system according to the invention;

FIG. 3 shows machinery of FIGS. 1 and 2 with a traction rope;

FIG. 4 shows machinery of the system according to the invention with tool carrier and reclining work surface provided with seeds container;

FIG. 5 shows a first tool (harrow with teeth) for machinery of the system according to the invention;

FIG. 6 shows a second tool (harrow with discs or morgano) for machinery of the system according to the invention;

FIG. 7 shows a third tool (mower) for machinery of the system according to the invention;

FIG. 8 shows a fourth tool (ripper or subsoiler) for machinery of the system according to the invention;

FIG. 9 shows a fifth tool (roll) for machinery of the system according to the invention;

FIG. 10 shows a sixth tool (seeder) for machinery of the system according to the invention;

FIG. 11 shows a seventh tool (manure) for machinery of the system according to the invention;

FIG. 12 shows some tool for machinery of the system according to the invention;

FIGS. 13 and 14 show step 1 and step 1-step 2 working of a machinery of system according to the invention;

FIG. 15 shows working of mowing for machinery of the system according to the invention;

FIG. 16 shows tool lifting operation for machinery of the system according to the invention;

FIG. 17 shows seed loading operation for machinery of the system according to the invention; and

FIG. 18 shows detail of cable-laying telescopic arm for machinery of the system according to the invention.

Referring first to FIGS. 1 and 2 of the enclosed drawings, it is shown a machinery of the system according to the invention, generically indicated by reference number 1. Obviously, it will be necessary for funicular traction plowing providing two machineries 1 according to the invention, working coupled each other. In any case, for the purposes of the present invention, it will be sufficient describing only one of said machineries, since they are perfectly symmetric while operating.

Machinery 1 provides a frame 2, provided with four steering driving wheels 3, a driving and reversible control unit 4. A hoist 5 is mounted on said frame 2, said hoist 5 being provided with motor 6 and batteries 7, which, in the solution shown in the drawings, are supplied by energy provided by an electrode connected by an electric cable (not shown), and as auxiliary mode, by solar panels 8, mounted on the machinery. Hoist is provided with a safety clutch 16 preventing breaking cable 13.

Each machinery 1 provides stabilization electric jacks 9 (provided on the operation side of machinery 1, i.e. toward inside the field to be worked on), and stabilization weights 10 (counterweights). A reclining working surface 11 is provided behind the machinery 1. Above, machinery 1 provides a turret 12 for positioning equipments for the independent and remote automatic driving and/or communication equipments.

The solution according to the invention provides an electronic unit (inside the driving unit, and thus not visible in the drawings) controlling the operation of machineries and managing driving, operative procedures by an autonomous and remote automatic driving, without the driver and based on algorithms also using Parallel Tracking system.

Machinery 1 can also be commuted from automatic driving in manual driving, useful for transferring the same from a field to another one.

In order to obtain the above, driving unit 4 is provided.

Electronic unit provides a sophisticated positioning system, which comprises a satellite, radar and laser system, receiving all the information necessary for managing automatic driving under every condition, avoiding obstacles and ground roughness and managing alignment between machineries and advancement along the field.

Electronic system further comprises a communication system between machineries based on Wi-Fi and optional sensors provided on tools, Wireless Sensor Networks (WSN) aimed to ensure synchronism between the same and preventing working mistaken.

Observing now also FIG. 3, it is also shown cable 13, wound and unwind from hoist 5, and on which ground working tool (not shown in the figure) couples, some type of tools being shown in FIGS. 5-11.

Particularly, FIG. 5 shows a harrow with spikes 101, FIG. 6 a harrow with discs 102 or morgano, FIG. 7 a mower 103, FIG. 8 a subsoiler or ripper 104, FIG. 9 a roller 105, FIG. 10 a harvesting head 106, and FIG. 11 a manure machine 107.

As already said, when using the system according to the invention, two machineries 1 are placed on opposed sides of a field to be subjected to working (respectively one right-handed machinery and one left-handed machinery), each one provided with hoist 5, on which one or two metallic cables 13 wind, each cable having a length at least equal to the distance between the two machineries. Free ends of cables 13 are fixed to opposite hooks of the working tool (e.g. a harrow with spikes 102 as shown in FIG. 5).

Actuating one of the hoists 5 (active hoist) and leaving the second one in an idle mode (passive hoist), tool 102 will be moved toward machinery 1 exerting traction action, thus working the ground (in the present case harrowing) along direction (according to the arrow) between the two machines 1.

A telescopic arm, shown in FIG. 18, provided on tool 102, places cable 13 directly according to next active working position (e.g. seeding and manure), in order to permit working even with culture without damaging the same.

Once at the end of its path, tool 102 will be, if necessary, inverted by an inversion mechanism setting the same for working according to the opposite direction, or it will be used in its bi-directional configuration, as for harrow 102.

Now, machineries 1 according to the invention, using the electronic positioning system, will move of an active length equivalent to the working width (e.g. plowing width) and actuation of hoists 5 will be inverted: driving (active) machinery 1 will put its hoist 5 in an idle mode (thus becoming passive) and the second one (passive) will actuate its hoist 5 (thus becoming active).

As already said, for every tool advancement direction inversion, machineries will advance along lateral headland of a distance equal to the working width.

In order to avoid the need of interrupting working, displacements are alternate, i.e. at the beginning of the every stroke, advancing only machinery with the tool moving away and with the idle hoist 5.

Start of displacement occurs through the electronic control system, the algorithms of which simulate Fowler mechanical system, without using an anchoring point on ground.

Commutation and displacement speed are essential to prevent cable friction losses and slipping of the same on ground.

At the end of working of the whole field, tool will be released from cable by pins and cable 13 wind again around hoist 5, thus permitting to the machinery 1 movement for subsequent workings.

Electric supply of machineries 1 is ensured by a surface electrode (fully or partially permanent or movable) (not shown) at the headings of the field to be subjected to working.

Best exploitation of technology suggested is obtained also providing renewable energy sources (e.g. photovoltaic, aeolic or biomass energy), of the farm of close to the farm where the working is carried out.

Machineries 1 alternatively are driving machines, connecting the agricultural tool 100 (teeth harrow and/or disc harrow or morgano, seeder, ripper or subsoiler, roll, manure) to the two steel cables 13 operated by electric hoists 5, that can be of the vertical or horizontal axis drum type.

Motors 14 of wheels 3, tool lifting slides 15, safety friction 16 and switching lights 17 are shown in the various figures.

Machinery according to the invention can further comprise means for independent and remote automatic driving, comprised of hardware and software elements that, while driving means for ground working, must ensure a high safety level and at the same time permitting an easy programming of paths and a proper cover of the surface to be subjected to working.

Means for independent and remote automatic driving must be able to:

-   -   set a safety mode (stop) in case of failure or anomalies;     -   permitting to the operator defining working perimeter and ground         working modes;     -   following set path with the two machineries;     -   maintaining distance between the two machineries;     -   slowing down or accelerating working on the basis of inputs         received from optional WSN sensors provided on working tools;     -   making an emergency stop in case of obstacles along the path.

In order to ensure a safety operation, perimeter of ground to be subjected to working must be created by a limit that can be detected by laser scanners (reticulate, palisade, wall, hedge or even poles at a regular distance each other).

By a GIS (Geographical Information System) graphic application on console, operator individuates on map perimeter of ground.

Means for independent and remote automatic driving verify that position of limit detected by laser scanner, and geo-referenced by GPS, corresponds to instructions (and to the map) received from operator console. If anomalies are detected (lack of physical limit or no correspondence with the map), system enter in a safety mode, interrupting working and sending an alarm to the console.

Means for independent and remote automatic driving on board of each machinery is comprised of:

-   -   on board systems;     -   remote control console.

Each one of the two machineries is provided with a system comprising:

-   -   processing unit;     -   communication unit;     -   GPS receiver;     -   laser scanner;     -   camera (optional).

Console is provided with:

-   -   control computer;

Graphic interface;

-   -   communication unit.

Processing unit is comprised of a “safety critical” application computer based on a calculation system with two processors connected by a 2oo2 architecture.

According to the 2oo2 paradigm, two processors comprising the processing unit carry out the same functions, comparing intermediate results. In case one of the computers detects a discordance, it would put processing unit in a safety mode making a controlled transaction in a state involving stop for anomaly/failure of the whole system and sending an alarm to the console.

Two machineries and console communicate by a safe protocol using a Wi-Fi physical channel for transporting data. Safe protocol ensures:

-   -   integrity of communication. Corrupted data are rejected and         transmitted again;     -   identity of different units. Three units (two means and console)         are univocally associated with a cryptographic key making it         impossible both malicious or occasional intrusion of other         entities or wrong addressing;     -   proper data sequence is ensured associating a serial ID and a         “time stamp” to every pack.

In case of lack of communication or in presence of data flow anomalies, driving system software sops the system.

Each one of the two machineries is provided with a GPS receiver used to define the working path on ground.

Each one of the two means is provided of a bi-dimensional laser scanner which is used for:

-   -   individuating limits of ground to be subjected to working;     -   individuating possible obstacle on ground;     -   evaluating the position each other of the two machineries.

Two machineries can be provided with a WSN module communicating with on board optional sensors of working tools and receives information suitable to modify and/or adapt working parameters to the climate and ground conditions.

Two machineries can be provided with camera, not for driving purposes, but that can be used to visualise ground from operator console.

Console is based on a “Mobile PC” suitable to be used in an open environment (control computer) provided with graphic interface to define working program, i.e.: limiting machineries path (ground perimeter) and defining working path and modes.

By communication unit, console can transmit working program to machineries, verifying position of machineries, carrying out diagnostic activities, interrupting or modifying working.

Autonomous driving means flowchart:

Those in the following are technical-structural particulars of a machineries 1 according to the invention, and they are givn only for exemplificative purposes, in order to show how it can be specifically realised a machinery according to the invention, but it is to be understood that they cannot be unduly used to limit the scope of the invention.

Particularly, in this exemplificative realisation, it has been used:

-   -   Zinc-plated steel beam frames 2, with the following pitch: 2.50         m, 3.00 m and 3.50 m—width: 1.50 m, 2.00 m and 2.50 m—track:         2.00 m, 2.50 m and 2.70 m—length: 3.50 m, 4.00 m and 4.50 m,         with a fixed ballast support of 1t.     -   hoist 5 having diameter of: 1.80 m, 2.00 m and 2.20 m, exit from         right side or left side according to the working;     -   electric jacks 9 necessary to oppose to the hoist traction         force;     -   toot lifting slides, lifting the working tools, provided on the         right or left side, on the basis of the working side;     -   tool-bearing surface 11, suitable to support working material         (e.g. seeds, fertilizing, solid or liquid manures, ecc.)     -   turret for positioning equipments, for autonomous remote         automatic driving and communication apparatuses, receiving         transceiving antennas of GPS, Radar and Laser systems; further         supports antennas and optional Wi-Fi Communication and Wireless         Sensor Networks (WSN) systems;     -   electronic unit: it processes information received from         apparatuses installed on turret and drives the automatic driving         guide (lacking the driver) on the basis of the set working         programs; it has a keyboard and a monitor for manual driving         (when the driver is on board);     -   electric motor with three levels of power (40 KW, 60 KW, 100         KW), with power variation transmission for hoist and cable         anti-breaking device of the safety friction and advancement         variator type, with four wheel drive;     -   both axes with iso-diametric steering wheels 3 provided with         axial electric motors;     -   wheels with 24″, 28″ and 30″ rims;     -   steel cable with a diameter of 20 mm, 30 mm and 40 mm, having         suitable elasticity and resistance properties;     -   working tools:         -   plowing: mono- or poli-plough reversible plow (not shown);         -   harrowing: spring, teeth and/or disc harrow (morgano), that             can be adapted to the different kind of ground and agronomic             needings, all the tools being reversible tools;         -   subsoiler: ripper or subsoiler;         -   seeding: reversible and rechargeable reversible seeder and             manure, with automatic loading of the turnable tool             supporting surface of machinery;         -   spraying: reversible sprayer bar, resting on slides (as             reversible skis) or on wheels, with nozzle-supporting bars             having a variable width supplied by tool supporting surface             by tube winding rolls (not shown);         -   rolling: Cambridge type or smooth roll with different width             and bi-directional rolling;         -   collection: headings that can be adapted to the different             type of products, with or without transportation of the same             toward the machinery tool supporting surface.     -   safety lighting lights 17, automatically used when working;     -   diving seat 4 and autonomous and remote automatic driving         console, with steering wheel, braking (service and parking         brakes) and variator control; it also houses auxiliary manual         controls such as stabilizers, hoist, ecc.     -   battery pack 7, with high capacity lithium or hydrogen         batteries, with automatic charge supply when under tension;     -   photovoltaic generator 8: stand-alone photovoltaic current         generator, supplying the battery pack in case of lack of power         supply.

Operation of a system according to the invention provided with GIS will be described in the following.

a. Setting of Working Geographic Perimeter

GIS graphic interface permits limiting working limit on the map. The system permits defining limits as a trapezium.

During this phase, it is also defined the traction machinery advancement direction.

During this step, software controls some geometric parameters, and particularly that distance between the two basis (a and b) is sufficient, and that distance between trapezium sides is sufficient, and then identifies position to start traction machineries.

Then, drive and working autonomous control system is programmed, defining geographic limits of ground to be subjected to working.

Working lines are perpendicular to the advancement direction: traction machineries advance parallel with respect to the trapezium sides, and operator only has to indicate the working direction.

During working, geographic limit is always compared with physical limit detected by telemetric sensors (laser scanner).

b. Delimitation of Working Physical Perimeter

During this phase, operator must verify that geographic perimeter delimitated during step a. Corresponds to physical delimitators provided on ground.

To this end, he/she puts reflecting poles along geographical working perimeter every 2-5 meters.

Poles positioning operation cane be eased by a GPS connected with the same instrument employed to define geographic limit, thus evidencing the operator position on ground directly on interface.

Traction machineries will continuously compare physical limit and geographic limit, and every difference will be recorded: a too large difference will immediately cause a stop of working.

c. Working Verifications

a. and b. can be carried out only once, and they are valid for every king of working carried out on the same ground.

Working verifications must be carried out before every working step.

During this step, operator must verify that ground is free from obstacles, the physical limits are safer and in good conditions, that ground is suitable to working.

Traction machineries are placed as required by working program processed by the system

Positioning of traction machineries is obtained making the dark triangle (real position of the specific traction machinery) coinciding with clear triangle (set position of the traction machinery start).

If activities are for any reason suspended, traction machineries “start set position” will be the position where activities have been suspended and specific traction machinery must be positioned in the specific point.

d. Start of Working

This phase can be started only when specific traction machinery is positioned in the position set for start.

Second traction machinery is positioned at the distance provided for the type of working and the suitable tool is mounted on the machinery.

Traction machineries verify at start:

-   -   that on board self-diagnostic gives a positive result;     -   that position is correct (specific traction machinery must be in         the position set at start and second traction machinery verifies         its position with respect to the first one);     -   that working physical limit is properly juxtaposed to the set         geographic limit

e. Working

Starting conditions:

field observed from a side to b side;

first tractor on the left of the field with hoist open rightward (left-hand machinery);

second tractor on the right of the field with hoist open leftward (right-hand machinery);

and thus

Step 1) first tractor releases working tool;

Step 2) second tractor puts hoist in a idle mode, i.e. with minimum tension;

Step 3) second tractor releases and lifts its own jacks;

Step 4) second tractor advances of a distance corresponding to a machinery length;

Step 5) second tractor points its own jacks within the ground to have the highest resistance;

Step 6) second tractor drags tool by its own hoist toward itself;

Step 7) second tractor, after having worked the line, lifts the working tool along the guides;

Step 8) second tractor releases working tool;

Step 9) first tractor puts hoist in an idle mode, i.e. with the minimum tension;

Step 10) first tractor releases and lifts its own jacks;

Step 11) first tractor advances of a distance corresponding to a machinery length;

Step 12) first tractor points its own jacks within the ground to have the highest resistance;

Step 13) first tractor drags tool by its own hoist toward itself;

Step 14) first tractor, after having worked the line, lifts the working tool along the guides.

Before every step, radio visibility and lack of obstacles between machineries are further verified and sensors on the tool are interrogated.

During steps 6) and 13), resistance conditions of ground are verified during traction and, if necessary, clutch is used.

The present invention has been described for illustrative and not limitative purposes, according to its preferred embodiments, but it is to be understood that variations and/or modifications can be introduced by those skilled in the art without departing from the relevant scope, as defined in the enclosed claims. 

1. Agricultural funicular traction system with electric propulsion, said system comprising two agricultural machineries, respectively one left-handed machinery (1) and one right-handed machinery (1), working as a couple, said machineries (1) left-handed and right-handed being technically identical, each machinery (1) providing a frame (2), with four wheels (3), a driving and reversible control unit (4), a hoist (5), provided with safety clutch (16), round which a cable (13) winds, jacks (9) for steadiness, on the working side of the machinery (1), towards the field to till, and weights (10) for steadiness (counterweights), means for independent and remote automatic driving, the work as a couple of said machineries (1) left-handed and right-handed being realized by means of said cable (13) having appropriate elasticity and tensile strength features, that extends, winding and unwinding during the work, between the respective hoists (5) of the two machineries (1), on said cable (13) being provided an agricultural tool (100) that moves, at the same time as said cable (13) winds around said hoists (5), between said left-handed and right-handed machineries (1), said system being characterised in that it is provided, in correspondence of the coupling of the agricultural tool (100) with said cable (13), with a telescopic arm able to lift the cable (13) during the advancement of the machineries (1) for the positioning in the next work position.
 2. Agricultural funicular traction system with electric propulsion according to claim 1, characterized in that four driving and steering wheels (3) are provided.
 3. Agricultural funicular traction system with electric propulsion according to claim 1, characterized in that said hoist (5) is provided of an engine (6) and batteries (7), preferably batteries supplied with power provided by a power line connected to an electric cable and/or solar array (8) set on each machinery (1).
 4. Agricultural funicular traction system with electric propulsion according to claim 1, characterized in that said jacks (9) for steadiness are electric jacks.
 5. Agricultural funicular traction system with electric propulsion according to claim 1, characterized in that on each machinery (1) a tool carrier and reclining work surface (11) is provided.
 6. Agricultural funicular traction system with electric propulsion according to claim 1, characterized in that each machinery (1) provides a turret for positioning equipments for the independent and remote automatic driving and/or communication equipments (12).
 7. Agricultural funicular traction system with electric propulsion according to claim 1, characterized in that it comprises a quick hook and release system for said working tools.
 8. Agricultural funicular traction system with electric propulsion according to claim 1, characterized in comprising at least one of the following tools: single or multi furrow reversible plough, reversible harrow with springs, spikes (101) or discs (102), reversible mower (103), two-faced sowing machine (106) with automatic loading, two-faced manure machine (107) with automatic loading, two-faced spraying bar, subsoiler or ripper (104), bidirectional roller (105), Cambridge type or smooth type, harvesting head.
 9. Agricultural funicular traction system with electric propulsion according to claim 1, characterized in that said means for independent and remote automatic driving allow implementing an automatic driving system that permits the user to: set in a safety mode (with stop) in case of breakdowns or anomalies; define the working perimeter and the field tilling modes; follow the established way with the two machineries (1); keep the same distance between the two machineries (1); slow down or accelerate the work according to the inputs got from optional WSN sensors set on the working tools; to make an emergency stop in case of obstacles laying in the way.
 10. Agricultural funicular traction system with electric propulsion according to claim 9, characterized in that the perimeter of the field to till is materialized in a boundary that can be revealed by a laser scanner (wire netting, fence, boundary wall, hedge, or posts spaced at the same distance apart, too), so that, by a GIS (Geographical Information System) graphic application on a console, the user locates the field perimeter physically materialized.
 11. Agricultural funicular traction system with electric propulsion according to claim 9, characterized in that said means for independent and remote automatic driving verifies the material boundary position, revealed by laser scanner and geo-referenced by GPS, agree to inputs (and maps), in case of anomalies (physic boundary is absent or does not agree with maps), the system getting into safe mode, stopping the work and sending an alarm to the console.
 12. Agricultural funicular traction system with electric propulsion according to claim 9, characterized in that said means for independent and remote automatic driving on each machinery (1) comprises: systems on the two machineries (1), comprising a processing unit; a communication unit; a GPS receiver; a laser scanner; a camera (optional); and a remote control console comprising a control computer, a graphical user interface and a communication unit.
 13. Agricultural funicular traction system with electric propulsion according to claim 9, characterized in that a software is provided, said software executing the following steps: a. setting working geographic perimeter; b. delimiting the working physical perimeter; c. verifications for working; d. starting working; e. working.
 14. Agricultural funicular traction system with electric propulsion according to claim 13, characterized in that during said working step (e.), the following steps are executed: starting conditions: field observed from a side to b side; first tractor on the left of the field with hoist open rightward (left-hand machinery); second tractor on the right of the field with hoist open leftward (right-hand machinery); and thus Step 1) first tractor releases working tool; Step 2) second tractor puts hoist in a idle mode, i.e. with minimum tension; Step 3) second tractor releases and lifts its own jacks; Step 4) second tractor advances of a distance corresponding to a machinery length; Step 5) second tractor points its own jacks within the ground to have the highest resistance; Step 6) second tractor drags tool by its own hoist toward itself; Step 7) second tractor, after having worked the line, lifts the working tool along the guides; Step 8) second tractor releases working tool; Step 9) first tractor puts hoist in an idle mode, i.e. with the minimum tension; Step 10) first tractor releases and lifts its own jacks; Step 11) first tractor advances of a distance corresponding to a machinery length; Step 12) first tractor points its own jacks within the ground to have the highest resistance; Step 13) first tractor drags tool by its own hoist toward itself; Step 14) first tractor, after having worked the line, lifts the working tool along the guides.
 15. Agricultural funicular traction system with electric propulsion according to claim 2, characterized in that said hoist (5) is provided of an engine (6) and batteries (7), preferably batteries supplied with power provided by a power line connected to an electric cable and/or solar array (8) set on each machinery (1).
 16. Agricultural funicular traction system with electric propulsion according to claim 2, characterized in that said jacks (9) for steadiness are electric jacks.
 17. Agricultural funicular traction system with electric propulsion according to claim 2, characterized in that on each machinery (1) a tool carrier and reclining work surface (11) is provided.
 18. Agricultural funicular traction system with electric propulsion according to claim 2, characterized in that each machinery (1) provides a turret for positioning equipments for the independent and remote automatic driving and/or communication equipments (12).
 19. Agricultural funicular traction system with electric propulsion according to claim 2, characterized in that it comprises a quick hook and release system for said working tools.
 20. Agricultural funicular traction system with electric propulsion according to claim 2, characterized in comprising at least one of the following tools: single or multi furrow reversible plough, reversible harrow with springs, spikes (101) or discs (102), reversible mower (103), two-faced sowing machine (106) with automatic loading, two-faced manure machine (107) with automatic loading, two-faced spraying bar, subsoiler or ripper (104), bidirectional roller (105), Cambridge type or smooth type, harvesting head. 